create trigger on view

Greetings!  Somewhere between 7.1 and 7.2, creating triggers on insert
to a view has been disallowed.  The docs still report it as a
possibility -- see rules vs. triggers.  Worse, we have a postgres
database relying on this feature for several years now.  What can I
do?  I suppose I could use a rule, but all the insert rule examples I
can find in the docs have simple sql do instead clauses, whereas my
trigger called a rather involved plsql function.  

Advice most appreciated.

Take care,


-- 
Camm Maguire                             camm@enhanced.com
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"The earth is but one country, and mankind its citizens."  --  Baha'u'llah